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Hi all, I've found an old thread which seems to confirm that DP8 is a BYD73D. https://68kmla.org/bb/index.php?threads/what-is-dp8-macintosh-analog-board.31559/ The BYD73A seems to be readily available, but it's only a 50V part versus the BYD73A which is 200V. I was hoping to get a few as...

Thank you :) It might be a BYD73D, which is an ultra-fast low-loss controlled avalanche rectifier: https://www.jotrin.com/product/parts/BYD73D I can't find a suitable supplier though, I'll keep looking.

Hi all, I've got a Mac Classic analogue board with DP8 damaged due to electrolyte leakage. It's used in the -12Vdc circuit, by the looks of things. The schematic says "BY 73D", and the parts says "PH 73" or vice versa, but I can't find any information on either of these. Does anyone know the...

Hi all, I recently wrote a short article on the process that I followed for building and configuring a set of BlueSCSI SD card adapters, then using them to backup and replace the original mechanical hard drives in my Macintosh Classic and Classic II - please see below, I hope it's of use and/or...

Hi all, I’ve fixed up my Mac Classic and I’m very pleased with it so far, but I’m having some problems with its RAM expansion. It came with a 1MB RAM card with two 1MB SIMMs installed, so I should be getting 4MB RAM total. However, only 2MB shows up under system information. What’s also weird...

Thank you 😊 I meant to mention in my original post that the B+ adjustment potentiometer PP1 doesn’t seem to be affecting the voltages at all. I’ve cleaned the pot and tested it out of circuit and it seems OK.

Hi all, I've recently got my hands on three compact Macs - a Classic and two Classic IIs. I've got the Classic and one of the Classic IIs working well, which is great. However, the other Classic II is putting up a fight. Not only is the digital board not working (recapped but needs a new CPU...